Stabilization of iodide-containing brines and brine mixtures
a technology of brine mixture and iodide, which is applied in the direction of earth drilling, wellbore/well accessories, chemistry apparatus and processes, etc., can solve the problems of wellbore stability problems, blowout, and tubular blockage in wellbore or equipmen
Active Publication Date: 2022-09-27
TETRA TECH INC
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AI Technical Summary
Problems solved by technology
As the density of a brine increases above the salt side of the eutectic point so does the true crystallization temperature (TCT) and pressure crystallization temperature (PCT), which can cause blockage to tubulars in a wellbore or in equipment on the surface if the fluid crystallizes.
If crystallization occurs and the solid is filtered from the brine, this will lead to a decrease in fluid density and can cause wellbore stability issues or a blowout.
However, zinc is a marine pollutant and can cause issues in the processing stage if residual zinc is in the oil sent to the refinery.
Addition of zinc brines can cause a sharp decrease in pH leading to high corrosion rates.
Cesium formate is available only in limited supply making it cost-prohibitive for wellbore operations requiring significant volumes of fluid.
However, iodide brines are unstable and form iodine when exposed to oxygen or carbon dioxide in air.
The conversion of iodide to iodine is detrimental to properties of the brine such as discoloration and precipitation.
Additionally, the free iodine can destabilize additives present in the brine.
Due to this instability, iodide brines have not been widely used in commercial wellbore activity applications.
Method used
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example
[0026]Example. This example analyzed the use of an iodide protectant in an iodide brine. An iodide-containing brine contained 34.0 wt % water, 13.6 wt % NaBr, 42.4 wt % NaI, and 10 wt % sorbitol. The iodide-containing brine had a density of 15.0 lb / gal measured at a temperature of 60 deg F. and a TCT of 42 deg F. The iodide-containing brine was allowed to stand at ambient temperature for one month at which time the iodide-containing brine was a dark orange color. Sample 1 was maintained as a control sample. Samples 2-7 were created by adding varying amounts of the iodide protectant DEHA to the aged iodide-containing brine to produce iodide brines. The samples were then subjected to American Public Health Associate (APHA) color tests according to ASTM D1209 at times following addition of the DEHA, as indicated in Table 1. The AHPA color tests were conducted to determine the minimum treatment level.
[0027]
TABLE 1Properties of brines at ambient temperaturesDEHA Conc.APHA afterAPHA after...
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Abstract
A composition for use in a wellbore activity, the composition comprising an iodide brine, the iodide brine operable to be used in the wellbore activity, the iodide brine comprising an iodide salt, an aqueous fluid, and an iodide protectant, the iodide protectant operable to prevent the presence of free iodine in the iodide brine, where the iodide protectant is present in the range between 0.001 v / v % and 5 v / v % of the iodide brine.
Description
TECHNICAL FIELD[0001]Described are compositions for use in wellbore fluids in well operations. More specifically, described are compositions with low crystallization temperatures and high densities for use in wellbore fluids in well operations.DESCRIPTION OF THE RELATED ART[0002]When used in well operations, brines can crystallize if exposed to lower temperatures and / or higher pressures. As the density of a brine increases above the salt side of the eutectic point so does the true crystallization temperature (TCT) and pressure crystallization temperature (PCT), which can cause blockage to tubulars in a wellbore or in equipment on the surface if the fluid crystallizes. If crystallization occurs and the solid is filtered from the brine, this will lead to a decrease in fluid density and can cause wellbore stability issues or a blowout. Applying pressure to a brine at a density above the eutectic point will lead to an increase in density, which in turn can lead to crystallization.[0003]...
Claims
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IPC IPC(8): C09K8/86C09K8/528C09K8/06E21B21/00C09K8/506C09K8/03
CPCC09K8/528C09K8/032C09K8/06C09K8/506C09K8/86E21B21/00
Inventor MACK, ARTHUR G.FOWLER, DREW A.VINCENT, PHILLIP A.
Owner TETRA TECH INC